Latest Contributions by KenWalsh

Hi guys, I am back to this issue. I have finishing mapping all of the faults, over 20k of them. It is finished for now but may need to be done again. So I have returned to the issue of trying to "teach" ArcGIS to recognize the linear polygon shape from differences in shade (grayscale) and plotting the identified polygon. I am going to convert some of my tiffs to grayscale to see if I can achieve it. From the Minimum Bounding Geometry aspect, the numbers I got were sufficient although it would be nice to get more accurate numbers. My questions: If I am using ArcGIS Desktop 10.4 do you believe this may be achievable? If so, a possible path to achieve this? If I were to upgrade to ArcGIS Pro, is it more achievable? Does ArcGIS Pro have better tools to accomplish what I am attempting? Thank you again for all of your help with my problem. Ken ... View more

Good morning gentlemen, Mr Patterson I'll have to check and see if I have those licenses. I do have a question for you both. If you were given 16 tiff files, that are not DEMs, contain no real metadata. You were tasked to map those cracks as they appear on each of the tiffs. Your goal is to map the faults and then get the length and width of the faults in order to build a computational model to replicate the faulting process. What would be the optimal way of achieving that the initial goals of mapping and calculating in ArcGIS 10.4?   ... View more

Thank you Mr. Patterson ... View more

Thanks Xander, I will admit that I don't have very much GIS experience so some of what you detailed I may have to ask you about. The background is a layer of clay-cake, not very large as you pointed out. This is a geology experiment. When you apply tension to the cake from the left and right, small cracks will start to form, these represent rocks faulting. As more pressure is applied these small cracks grow into each other creating larger longer faults. So I have a selection of time series tiffs representing different strain amounts. I created a shape-file with a circle, an area of interest, see attached. I don't want near the perimeters as they will start to bow as the stretching increases. What I want to get from each of the cracks is the mid-line length and maximum width, if possible. Now knowing GIS, I managed to get the tiffs in with a worldfile that I think makes sense. Overlay the tiff with AOI circle and then create a new shape-file and start by hand plotting each of the cracks. I had to choose a coordinate system so I chose WGS1984_UTM_Zone_13, I have no idea if thats what I should have chosen as this is a tiny rectangle not representing anywhere. To map each slide, as you can imagine, takes hours and there are a lot of slides, so if there is a more efficient way to accomplish this I would love to learn it. I admit from "threshold .... Feature to Polygon" in your post I was lost; ignorance is a curse. There are no curved lines on the polygons. Hope this makes it a little clearer. ... View more

Let me know if this suffices Xander, thank you for your help. This is a shape-file I am currently working on, some of the polygons are not yet finished. ... View more

Hi Mr Bakker, what would you require? Would an export of an attribute table prior to running MBG be good? ... View more

Yes sir, I have a tiff with a shape-file overlain. On this particular shape-file there are approximately 1300 polygons; all generally oriented the same direction and usually long and narrow. I initially thought about an ellipse as being the best but obviously not an option in 10.4. Next I thought about using the Convex Hull but it doesn't return a width value for every polygon, see attached where some of the widths are zero. This is also the case if I use the rectangles. Only envelope returns a width for every polygon, however, that width is usually larger than the actual width. I am sure it is not an easily programmed solution. The number of vertices is not constant so trying to use x,y coordinates of each vertex to try and calculate the width is not trivial. I guess I will have to just use envelope. Rectangle by width would probably be the best fit but it also fails to return widths for some of the polygons. ... View more

Hi Mr Patterson, apologies for my late reply. I am using a shape file and folder, it was what I inherited. I am attaching an image of the type of polygon I am working with. Ideally, I would like to get a maximum width and a length for a mid-line down the center of the polygon. Is this possible in ArcGIS 10.4 desktop or even at all? ... View more

My geographic coordinate system is GCS_WGS_1984 and I use a Projected Coordinate System of WGS_1984_UTM_Zone_13N. I am using a shapefile overlaying a TIFF file to create the polygons. When I try and run the bounding containers on ArcMap 10.4 my dialog box does not have an option of minimum and area; it only has rectangle. I have attached a screenshot of the dialog box and then the error I received when I run the toolbox. I apologize but I have very little knowledge of GIS ... View more